package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 新增菜品和对应的口味
     * @param dishDTO
     */
    @Override
    @Transactional //开启事务注解-->需要去springboot启动类里面开启注解方式的事务管理 @EnableTransactionManagement
    public void savaWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //菜品：一次插入一条数据
        dishMapper.insert(dish);
        //口味表里面需要菜品的id，传递菜品id
        Long id = dish.getId();

        //口味：一次插入多条数据-->建议使用批量插入，配合动态sql完成业务
        List<DishFlavor> flavors = dishDTO.getFlavors();
        //当口味表有数据时执行插入操作
        if (flavors != null && flavors.size() > 0) {
            //在执行插入操作之前给flavor表的每一个属性加入id
            for (DishFlavor f : flavors) {
                f.setDishId(id);
            }
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 删除菜品
     * @param ids
     */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //删除菜品前，需要先判断菜品能否删除
        //条件一：是否存在起售中的商品，起售状态的商品不能删除
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE){
                //当前菜品处于起售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //条件二：是否被套餐关联，被关联的菜品不能删除
        List<Long> setmealIdsByDishIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIdsByDishIds.size() > 0 && setmealIdsByDishIds != null) {
            //当前菜品被套餐关联，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //条件判断完成后就可以执行删除操作，删除菜品和菜品关联的口味数据
//        for (Long id : ids){
//            //菜品
//            dishMapper.deleteById(id);
//            //口味
//            dishFlavorMapper.deleteByDishId(id);
//        }
        // TODO -->优化代码，用动态sql优化原来的删除功能代码,优化原因：当for循环id很大的时候，循环次数就会非常多，出现很多的删除的业务代码
        //根据菜品id集合批量删除菜品数据
        //sql: delete from dish where id in (?,?,?)
        dishMapper.deleteByIds(ids);
        //根据菜品id集合批量删除关联的口味数据
        //sql: delete from dish_flavor where dish_id in (?.?,?)
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /**
     * 根据id查询菜品表和口味表
     * @param id
     * @return
     */
    @Override
    @Transactional
    public DishVO getByIdWithFlavor(Long id) {
        //考虑两部完成--》1、根据id查询菜品数据
        //2、根据菜品id查询口味数据 3、将查询的数据封装在 dishvo里面
        Dish dish = dishMapper.getById(id);
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishID(id);
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    /**
     * 修改
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //修改菜品表基本信息
        dishMapper.update(dish);
        //删除口味表原有的信息
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //新增口味表传入的信息
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
        }//给口味数据赋值id后再进行赋值操作
        dishFlavorMapper.insertBatch(flavors);
    }
    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    /**
     * 菜品的起售和停售
     * @param status
     * @param id
     */
    @Override
    @Transactional
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);
        // TODO 如果是停售操作，还需要将包含当前菜品的套餐也停售
        if (status == StatusConstant.DISABLE) {
            // 如果是停售操作，还需要将包含当前菜品的套餐也停售
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);
            // select setmeal_id from setmeal_dish where dish_id in (?,?,?)
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(dishIds);
            if (setmealIds != null && setmealIds.size() > 0) {
                for (Long setmealId : setmealIds) {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setmeal);
                }
            }
        }
    }
}
